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AT48802-16QI Datasheet

  • AT48802-16QI

  • Spread- Spectrum Signal Processor Integrated Circuit

  • 23頁

  • ATMEL   ATMEL

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AT48802
Features
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Two Independent PN (Pseudo-Random Noise) Generators
Programmable R7 (128) to R13 (8,192) PN Sequence Lengths
Programmable Tau-Dither Amplitude
Programmable PN Phase Adjustment to 1/16 Chip
Correlation Acquisition Interface
Programming Register Control
Microcontroller Compatible Bus Interface
Patent-Pending Frequency Diversity
Low Speed Link Data Path for Supervisory and Setup Functions
Description
The AT48802 Spread-Spectrum Signal Processor (SSSP) chip from Atmel handles
all PN code generation, synchronization, and handshaking required for either station
(handset or base station) of a time division duplex direct sequence spread-spectrum
cordless telephone. The AT48802 supports RF spreading and despreading for the
best rejection of interference. In conjunction with a single-chip microcontroller, the
circuit performs the following functions:
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Generates a pseudo-random sequence for spreading the transmitted signal.
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Generates a pseudo-random sequence for despreading in the receiver.
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Generates a sliding phase PN for acquiring synchronization with an incoming
signal.
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Controls receive signal strength measurement timing for correlation peak
detection.
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Operates a tau-dither tracking loop, with adaptive threshold, to maintain
synchronization with the incoming signal.
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Controls transmit keying antenna switching for time-division duplexing.
Spread-
Spectrum
Signal
Processor
Integrated
Circuit
Preliminary
(continued)
Pin Configuration
64 Lead PQFP
0624A
2-1

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    Square Pushbutton Switch Cap White Snap Fit
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    Square Pushbutton Switch Cap Red, Red LED Snap Fit
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    Square Pushbutton Switch Cap Black, Amber LED Snap Fit
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    Square Pushbutton Switch Cap White Snap Fit
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    Square Pushbutton Switch Cap Red, White Snap Fit
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    Square Pushbutton Switch Cap Red Snap Fit
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    Square Pushbutton Switch Cap Yellow, White Snap Fit
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    Square Pushbutton Switch Cap Green, White Snap Fit
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    Square Pushbutton Switch Cap Green Snap Fit
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    Square Pushbutton Switch Cap Blue, White Snap Fit
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    Square Pushbutton Switch Cap Blue Snap Fit
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    Round Pushbutton Switch Cap White Snap Fit
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    Round Pushbutton Switch Cap White, Red Snap Fit
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    Round Pushbutton Switch Cap White, Green Snap Fit

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